How to open a port with a working vpn connection?

Question

VPN

Successfully opened a port for incoming connections according to the instructions www.youtube.com/watch?v=LmFXIJmYyd4
But as soon as I connect to vpn, the port is again displayed as closed (according to 2ip.ru/check-port ), which is logical in principle, all traffic goes through vpn server. Can I configure my routing so that traffic through this port goes past the vpn, through my main provider.
Purpose: to open a port for incoming connections so that users of my program can query the database located on my computer

Answer 1

Much easier to set up if you work through a service, for example thesafety.us/en

Answer 2

I want to describe my solution:
1. Register metrics - for VPN - 1, for the main network - 2.
2. Disable the checkbox about the gateway in the remote network for VPN
3. Register a static route to all IPs through VPN: route add 0.0.0.0 mask 0.0 .0.0 Gateway-VPN IP